From: "DaShiell, Jude T.  CIV NAVAIR 1490, 1, 26" <jude.dashiell@...>
Date: 2010-09-30T03:52:36+09:00
Subject: Re: The beauty of Ruby through examples

I take it rand() gets pseudorandom numbers from computer and as such
could be improved in one respect at least if ruby can be made to sleep
or wait for random numbers of milliseconds.  One complication with
random number generation is that two numbers can come off the belt in
the same millisecond.  However making ruby wait a random number of
milliseconds between each sample draw sample draw is the random numbers
to provide the user would solve that problem.  I just found the Pickaxe
book the other day and am reading through it and learning.  The thing I
don't know is how much solving this problem with pseudorandom numbers
would improve quality of samples.


-----Original Message-----
From: Adriano Ferreira [mailto:adrfer@yahoo.com] 
Sent: Wednesday, September 29, 2010 14:41
To: ruby-talk ML
Subject: The beauty of Ruby through examples

Hey all,

I'm about to introduce Ruby to a group of people that is not familiar to
the 
language, and the approach i'd like to take is simply by distilling out
a few 
sample codes. I've been collecting some from around the internet, but
i'd 
appreciate your suggestions as well.

I'm looking for code snippets that represent some of the beauty of Ruby 
actually, such as:

# Simplicity
# Expressiveness
# Productivity
# Flexibility
# Dynamism
# Freedom
# Happiness

Just to clear things up, here are few examples:

# Simplicity

vowels = %w(a e i o u)
alfabet = ('a'..'z').to_a
cons = alfabet - vowels
p cons

# Expressiveness

hello = 'Hello Ruby'
5.times { puts hello }

# Productivity

class Person
  # def name
  #   @name
  # end
  # 
  # def name=(other)
  #   @name = other
  # end
  # 
  # def age
  #   @age
  # end
  # 
  # def age=(other)
  #   @age = other
  # end
  
  attr_accessor :name, :age
end

john = Person.new
john.name = 'John'
john.age = 25
p john

# Flexibility

class Array
  def pick
    self[rand(self.size)]
  end
  
  alias :choose :pick
end

puts %w(1 2 3 4 5).pick
puts %w(1 2 3 4 5).choose

# Dynamism

Padawan = Class.new

class Jedi
  def train(padawan)
    def padawan.control_the_force
      puts "Now i'm ready to become a Jedi!"
    end
  end
end

skywalker = Padawan.new
yoda = Jedi.new
p skywalker.respond_to? :control_the_force  # => false

yoda.train skywalker
p skywalker.respond_to? :control_the_force  # => true
skywalker.control_the_force# => Now i'm ready to become a Jedi!


...and so on.

Any more examples?

Thanks in advance,

Adriano